* {
  margin: 0;
  padding: 0;
}

html {
  background-color: green;
}

body {
  background-color: red;
  position: relative;
}

#root {
  
}

.App {
  margin: 0;
  padding: 0;
  background-color: gray;
  overflow-y: visible;
}

.test-fix {
  position: fixed;
  bottom: 0;
  left: 100px;
  color: white;
  background-color: blue;
}